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Resumen del producto
Busquets-Vass, G., S.D., Newsome, M.A., Pardo, J., Calambokidis, S., Aguiñiga-García, D., Páez-Rosas, J., Gómez-Gutiérrez, L.M., Enriquez & D., Gendron
(2021).
Isotope-based inferences of the seasonal foraging and migratory strategies of blue whales in the eastern Pacific Ocean.
Marine Environmental Research.
163: 105201.
DOI: 10.1016/j.marenvres.2020.105201.
Isotope-based inferences of the seasonal foraging and migratory strategies of blue whales in the eastern Pacific Ocean
Geraldine Busquets-Vass, Seth D. Newsome, Mario A. Pardo, John Calambokidis, Sergio Aguiñiga-García 1, Diego Páez-Rosas, Jaime Gómez-Gutiérrez 1, Luis M. Enriquez y Diane Gendron 1
1 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas
Migratory marine megafauna generally move vast distances between productive foraging grounds and environmentallystable breeding grounds, but characterizing how they use these habitats to maintain homeostasisand reproduce is difficult. We used isotope analysis of blue whale skin strata (n = 621) and potential prey (n =300) to examine their migratory and foraging strategies in the eastern Pacific Ocean. Our results suggest thatmost whales in the northeast Pacific use a mixed income and capital breeding strategy, and use the CaliforniaCurrent Ecosystem as their primary summer-fall foraging ground. A subset of individuals exhibited migratoryplasticity and spend most of the year in the Gulf of California or Costa Rica Dome, two regions believed to betheir primary winter-spring breeding grounds. Isotope data also revealed that whales in the southern EasternTropical Pacific generally do not forage in the northeast Pacific, which suggests a north-south populationstructure with a boundary near the equator.
Palabras clave: Balaenoptera musculus; foraging ecology; behavior; Isotope mixing models; Marine ecology; Population dynamics; trophic overlap
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